Catalytic cracking assistant capable of increasing propylene yield with sulfur transfer agent function

Abstract

The invention provides a catalytic cracking assistant capable of increasing propylene yield with a sulfur transfer agent function, belonging to the improvement of catalyst assistant in the petroleum processing field. The assistant not only has the function of increasing the propylene yield, but also plays a role of a sulfur transfer agent in removing SOx in flue gas, and can lower dilution of a main catalyst, and the additive amount of the assistant is the same as that of a single assistant capable of increasing propylene yield. The design and preparation principle of the assistant are as follows: considering the chemical inertness and weaker surface acidity of magnesia-alumina spinel, the magnesia-alumina spinel is partially introduced in a ground substance, and ZSM-5 is adopted as an active component, thus the prepared catalyst serving as a catalytic cracking assistant can have the function of the sulfur transfer agent and the function of increasing propylene yield simultaneously bya small additive amount.

Description

technical field [0001] The invention relates to a catalytic cracking and pro-propylene additive with the function of a sulfur transfer agent, which belongs to the improvement of catalyst additives in the field of petroleum processing. This additive not only has the function of increasing the production of propylene, but also acts as a sulfur transfer agent to remove SOx in flue gas. . Background technique [0002] The chemical cracking unit is one of the main processing methods for producing gasoline and diesel products from heavy feedstock oil in my country. With the maturity of catalytic cracking technology and the diversification of demand, catalytic cracking is facing new challenges. Among them, the more significant trends are: ① The market demand for light olefins, especially propylene, is increasing year by year; ② With the trend of heavy and inferior processing raw material oil, the SOx (SOx) emitted from the FCC regenerator flue gas 2 , SO 3 The common name) cont...

AI Technical Summary

Problems solved by technology

CN1796498A has adopted metal and phosphorus oxide modified ZSM-5 molecular sieve additives to increase the production of propylene, but in actual use, metal oxides directly modify molecular sieves and often cover acid centers to reduce the effect of additives

[0006] However, the separate addition of prolific propylene promoter and sulfur transfer agent in the catalytic cracking process will increase the dilution effect on the catalytic cracking main catalyst, thereby reducing the conversion rate of the catalyst

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